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Related Party Agreements and Transactions (Revenue from Related Parties) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Related Party Transaction [Line Items]      
Rental income - related parties $ 718 $ 279 $ 235
MPC      
Related Party Transaction [Line Items]      
Service revenue - related parties 2,159 1,082 936
Rental income - related parties 718 279 235
Product sales - related parties [1] 49 8 11
Sales revenue, goods, related party, net zero $ 440 $ 254 $ 46
[1] There were additional product sales to MPC that net to zero within the consolidated financial statements as the transactions are recorded net due to the terms of the agreements under which such product was sold. For 2018, 2017, and 2016, these sales totaled $440 million, $254 million and $46 million, respectively